Twin lift



c. K. DuTzMAN 2,686,038

TWIN LIFT Alug. l0, 195.4

Filed Jan. 25, 1952 I5 Sheets-Sheet 1 28 saff 4s sl /a lo: 69 8g, Y Sgo95 ,154 55 5; "345 ,3'

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I: I [03 53/ l V Y 44 46 9L-B4 90 54 floo 44 465s 2;@ 4 3 2 9 CAR/ K.ourzMA N l n I l ATTORISEY 85' a4 2 2.5 izo Il 2 34.- 17 s 23 INVENTOR'Aug. 10, 1954 c. K. DUTZMAN TWIN LIFT 3 Sheets-Sheet 2 Filed Jan. 23,1952 INVENTOR CARL K. DuTzMAN ATTEY' Aug 10, 1954 c. K. DUTzMAN2,686,038

TWIN LIFT Filed Jan. 23, 1952 3 Sheets-Sheet 3 I N VENTOR :Ll-.. cA RLK. DuTzMA/v ATT NEY Patented Aug. 10, 1954 UNITED STATES AT'ENT OFFICEThe present invention relates to twin lift or jack for raising rooftimbers in mines, buildings, tunnels, subways, and/or raising metalgirders ior floors in buildings, and/or lifting girders and heavytimbers onto flat cars.

In mines where timbers are being used for .a roof or for reinforcing,the space is very limited, and it is difficult `for this reason, tov gettimbers in proper position.

An object of the present `invention is the provision of a twin lift orjack that is easy to operate and one that is exceedingly strong andsafe.

Another object of the present invention is the provision of a twin liftor jack maneuverable in any degree of a circle.

A still further object of the present invention is the provision of atwin lift or jack that may be manually or mechanically operated.

A still further object of the present invention is the provision of atwin lift or jack that may be operated vby cables or gears.

A still further object of the present invention is the provision ofbooms, standards or legs that are movable to a vertical or asemi-horizontal position.

A still further object of the present invention is the provision ofmeans for steadying the booms, standards or legs when in raised positionand for holding the booms, standards, or legs in spaced relation intheir open and closed position.

A still further object of the present invention is the provision ofsafety support engaging means for the booms, standards, legs in theirupward movement.

A still further object of the present invention is the provision ofmeans for releasing the safety support engaging means from the booms,standards or legs.

A still further object of the present invention is the provision ofmeans carried bythe booms, standards, legs, for elevating a timber,girder or the like.

A still further object of the present invention is the provision or"means for moving the elevating means in the booms, standards or legs.

A still further object of the present invention is the provision ofmeans for locking the safety support releasing means.

A still further object of the present invention is the provision ofmeans carried by the elevating means for receiving a timber, girder orthe like.

Further objects of the present invention, together wtih the advantagesthereof, will more fully appear when taken in conjunction with theaccompanying drawings; wherein,

Figure 1 is a front view of the device showing the booms, standards orlegs in elevated position, parts being brokenand in section.

Figure 2 is a top plan view of Figure 1, parts being shown fragmentary.

Figure 3 is a side elevational view of the device and showing the booms,standards or legs in retracted position.

Figure l is a sectional view taken on line 4-4 i of Figure l.

Figure 5 is an enlarged sectional view taken on line 5 5 of Figure 1.

Figure 6 is an end elevational View of Figure 1.

Figure 7 is a diagrammatic view of the drum, sheaves or rollers andcables, and showing the position of the booms when in raised position.

Figure 8 is an enlarged diagrammatic view of the cables, drum and.sheaves or rollers, the arrows indicating vclockwise andcounter-clockwise direction of movement of the drums and cables.

.Figure 9 is an end elevational view of the base frame.

Figure 10 is a front elevational view of a modied form of the invention,parts being broken away.

Figure 11 is a sectional view .taken on line l l-H of Figure l0.

Figure 12 is anend view of the base frame illustrated in Figure 10,parts being shown fragmentary.

Figure 13 is a horizontal view of one of the threaded shafts withassociated elements thereon and in section.

Figure 14 is a horizontal view of the drive shaft with associatedelements thereon and in section.

In the drawings, the numeral l5 represents the twin-lifter and .itcomprises a base frame made of channel beams Il and i8 that are held inspaced relation by smaller U-shaped transverse irons i9, and transversestraps 20 that are secured on the top flanges 2i and 22, and on bottomflanges 23 and 2t by spot welds 25. Mid.- way ,the ends of the channelbeams il and I3 there is secured on flanges 2i and 22 by spot welds orbolts 2t, supports 2l and 28 each having a semi-circular slot thataligns With a semi-circular groove 2,3 in the channel iron beams I'! andt3, the support '27 being provided with a slot 30 for a purpose thatwill presently appear. Mounted .on the flanges V2| and 22 adjacent thesupports 21 and 28, and secured by spot welds 3| are brackets 32 and 33,each of the brackets being provided with a bore 34, the purpose of Whichwill presently appear. To the flanges 23 and 2Q there is secured bybolts or other suitable means a wheel 35 having a central bore 36 thatreceives a pin 37.

In order that the twin-lift may rotate in a circular direction on thefloor of a mine, nat car or the like, a base 38 is provided whichcomprises arms 39 that are provided with bores 4i) that receive bolts lfor bolting the base to the floor of a building, iiat car or the like,and superposed on the base 38 and secured by bolts is a spacing plateft2, that spaces the wheel 35 from the base 38. The pin 3l passesthrough apertures that are centrally disposed in the base plate 38 andin the spacing plate 42, providing free pivotal movement for thetwin-lift.

The booms, standards or legs of the present invention being identical instructure, and for clarity, like numerals of reference indicate likeparts in the drawings. The booms, standards or legs 43 comprise channelirons 44 and i5 that are held in spaced relation by a band Mi at thebase of the booms, straps 41 and a. cap plate d3, all being secured tothe channel irons by bolts 45 or by spot welding, the cap plates beingprovided with a central aperture 50 for a purpose that will presentlyappear.

Interposed between the channel irons 134 and 45 at the base, is a block5l having pintles or pins 52 that pass through bores in the walls of thechannel irons 44 and 45 and carry shoe blocks 53, the bottom edge of theblocks slidably engaging the top edge fall of guide rails 55 that may besolid or angle iron, and they are secured to the inner faces of thechannel irons il and 8 by rivets or bolts 5t, each end of the shoeblocks 53 being provided with a semicircular groove l. Within the booms133 there is mounted a lift screw 58 having mounted on its bottom end aguide block 59 that is freely movable in the booms and serves as a shoefor the lift yscrews in their upward and downward movement. The upperend of each of the lift screws pass through the central aperture 5 ofthe cap plates 48, the diameter of the lift screws being of smallerdiameter than the apertures El), thus permitting the lift screws 58 tofreely move through the apertures. Pivotally mounted on the upper end ofeach of the lift screws 58 is a head Si) each having a block 5|, andarms 62 that are pivotal- 1y mounted to the blocks by bolts or pins t3.

'interposed between the arms 62 are rollers 6d that are supported bypins or bolts 65, the arms also being provided with a lock screw 66adapted to engage an element shown in dotted lines in Figure 1 that maybe interposed between the arms to prevent the element from slipping.Between the heads B and cap plates t8, and in threaded engagement withthe lift screws 53 is a wing-nut 6l, each adapted to move the screws 58and heads 6i! upwardly when moved in a clockwise direction, anddownwardly when moved in a counter-clockwise direction. On one face ofeach boom there is secured a rack-bar plate 68 for a purpose to bepresently described. Mounted between the brackets 32 and 33 by bolts 59for pivotal movement, are arms 'lil of element "il, each having a tongue'l2 that engages the teeth 'I3 of the rack-bar plates EB. Pivotallymounted in the slot 3G of support 2 by a pin 74 is a link T5 having anarm T6, and pivotally connected to the link by pins il is one end ofeach of the links 18, the opposite ends of the links being pivotallyconnected by pins i9 to one of the arms 1B of each of elements ll.Secured to the link 15 is one end 80 of spring 8l, the opposite end 82being secured to one of the transverse blocks 25, the spring serving asa medium for keeping the tongues 'l2 in engagement with the teeth it* inrack-bar plates 88 during upward movement of the booms, and when thebooms are in fully elevated position, the elements H serve as supportsfor the booms.

Mounted in the semi-circular grooves 29 and the semi-circular grooves insupports 2? and 28, is a shaft 83 having one end 855 extending beyondthe face of channel iron Il, the end being squared to receive a handle85 or a ratchet handle for use in close quarters, and if desired bothends of the shaft 83 may extend beyond both side faces of the channelirons il and i8 and both ends squared. Upon the shaft there is mounted aratchet wheel 8l and a drum 88 that is interposed between the channelirons il and i8, the drum being provided with a plurality of grooves 88and 9B for a purpose to be presently described. The support carries asafety hook lever Sl, having one end 92 bent and adapted to engage thehandle or arm 16 when the link I5 is moved to the left as shown bydotted lines in Figure l to hold the tongues E2 out of engagement withthe rack-bar teeth 13. A dog 93 is mounted on the outer face of bracket2l for engagement with the ratchet wheel 8l. The drum 88 is providedwith eyelets 34 as shown in the diagrammatic views 1 and that arediametrically positioned thereon, and to the eyelets there is securedone end of cables 95 each having a portion convoluted around the drum,and each portion engaged in in grooves 89, the cables 95 being engagedby sheaves or rollers 96 for guiding the cables during movement. Theopposite ends of the cables 35 are secured to the eyelets 91 carried bythe booms 43. The drum is further provided with eyelets 93 that arediametrically positioned thereon and in horizontal alignment and inspaced relation from the eyelets 94. Secured to the eyelets 98, is oneend 99 of cables lili), each having' a portion convoluted around thedrum,

and each portion being engaged in grooves 90, the cables being engagedby sheaves mi for guiding the cables during movement. The opposite ends132 of cables I0!) are connected to eyelets t3 that are carried by theoutside face of booms d3, the cables being engaged by sheaves IM.

Interposed between the booms 43 is a spreader bar 05, the ends beingprovided with a U-shaped slot 15S. A pivot pin IGT is carried by eachend of the spreader bar, the ends of the pivot pins being seated ineyelets |08 that are positioned on the inner faces of the booms andadjacent the top thereof. The spreader bar serves as a medium forkeeping the booms in spaced relation during movement.

In the modified form of the invention shown in Figures i9 and 11,instead of the cables 95 and iti), threaded shafts H6 are provided. Oneend t i i of each shaft is threadably engaged in a metal bar lf2 that isprovided with pinties H3 that engage the shoe blocks 53. The end of eachshaft has a reduced threaded portion il@ that receives a nut H5 thatserves as a stop for the shafts when the booms 43 are in fully raisedposition. The opposite end H6 of each shaft is of reduced diameter andit has mounted thereon a race bearing HT that is housed in a block H8that is positioned in the channel irons il' and i8, the blocks servingas a support for the shafts IH). On the end H6 of each shaft there iskeyed a beveled gear ||9 for a purpose to be presently described. Midwaythe ends of the channel irons |i and i3 there is mounted a beveled gear|20, and this gear meshes with gears H9. The shaft as shown in Figure 14replaces shaft S3 when gears are used and it is positioned midway theends of the channel irons I and |8, and it is provided with squared ends|22, and reduced portions i23 and ifi, and on each of these portionsthere is mounted a race bearing |25 that is housed in blocks ist thatare secured to the inner or outer walls of the channel irons H and It.Upon the reduced portion |23 there is mounted and keyed a beveled gearl2? that meshes with gear |26 that imparts movement to gears H9. One ofthe squared ends |22 or shaft |2| may receive a handle for manualoperation, and/or a ratchet handle, or it may receive a pulley wheel forconnection with va motor for mechanical operation.

In the operation of the device as shown in Figures l to 8, after thedevice has been positioned in a selected place and a timber or girder isplaced on the heads 66 of the booms t3, the handle 85 is moved in aclockwise direction and during this movement cables itil are convolutedin a clockwise direction onto the drum pulling the base of the booms :ittoward the ends of the channel irons Il* and EB, and during thismovement, cables 95 unreel from the drum 88 in a counter-clockwisedirection, the booms moving on the shoes 53 that slide on the rails 55,the booms moving in an arcuate path to a vertical position as shown inFigure l. During movement of the booms 113 to the vertical position, thedog 93 is in engagement with the ratchet wheel 8l, the spreader bar |05during movement of the booms holds the top portions of the booms inspaced relation and serves as a support for the booms against the pullof the cables S attached at the bottom of the booms. During the upwardmovement of the booms the tongues 'i2 of elements l! are held inengagement with the teeth 73 of the rack bar plates 88 by the spring 8|and they serve as a support for the booms. The timber or girder as shownby dotted lines in Figure l, carried by the heads or cradles @il on thebooms and secured in the heads by lock screws Bt, is now ready to beplaced in the -ceiling of a mine or building. The nnal step in raisingthe timber or girder is accomplished by releasing the lock screws @5,then manually turning the wing nuts 6l in a clockwise direction, thelift screws 58 moving upwardly, and during this movement the shoes 5Sslide in the channel irons lili and d5 that comprise the booms thusproviding free and easy movement of the lift screws 58. After the timberor girder has been placed in position in a mine or the like, thewing-nuts are rotated in a counterclockwise direction, the lift screwsmoving downwardly.

When the lift screws are in retracted position, to move the booms fromthe vertical to the substantially horizontal position as shown in Figure3, the link 'I5 is moved to the left, this moves links i8 and elements'il and disengages the tongues 'I2 from the rack-bar plates 68, theelements being held in disengaged position by the safety hook lever 9|.When the link l5 is moved to the left, the element on the left side ispulled to the right, and the element on the right side is pulled to theleft as shown by the dotted lines in Figure 1. Next the dog 93 isdisengaged from the ratchet wheel 8l and the drum rotated in acounterclockwise direction. During this movement of s. the drum 33,cables wind around the .drum pulling the base of the booms toward thecenter of the base frame, cables lil unwinding from the drum 88, thebooms being pulled to a full retracted position as shown in Figure 3.

In the operation ofthe modified form of the invention shown in Figures10 and 1l, the movement of thev booms with the associated elements isthe saine as previously described and hence it is believed only theoperation of the threaded bars iid is necessary. In the operation of themodified form ci the invention, when it is desired to move the booms L53to a vertical position, motion is imparted to the shaft l2 l, eithermanual or mechanical. This moves beveled gear i2? mounted thereon whichis in mesh with gear 29, and this gear being in mesh with gears H9 onshafts iid rotates the shafts. As the shafts rotate, 'the threads onshafts It that are in engagement with the threads in bars Iii?, move thebooms toward the ends 0f the base frame. When the booms are to beretracted, the shaft 52! is rotated in a counter-clockwise direction,the booms assuming the position as shown in Figure 3.

While the invention has been disclosed in connection with certainspecific embodiments thereof, it is to be noted that these are by way ofexample rather than by way of limitations and that the invention is tobe deiined by the attendant claims which should be given a scope asbroad as is consistent with the prior art.

What is claimed is:

1. In a mine beam lifting jack a base, an elongated substantiallyhorizontal element forming a tie bar, a pair of elongated spaced legspivotally connected adjacent their upper ends to the tie bar formovement adjacent opposite ends thereof in spaced vertical arcuate pathsfrom a substantially horizontal inactive position to a substantiallyvertical active position, means mounted on said base adjacent andoperatively connected to the legs remote from the tie bar for movingsaid legs in the arcuate paths and means mounted adjacent the leg movingmeans and engaging the legs for stabilizing the legs as they move in thearcuate paths.

2. In a mine beam lifting jack a base frame, an elongated substantiallyhorizontally disposed tie bar, a pair of elongated' spaced legspivotally connected intermediate their ends to the tie bar for movementadjacent opposite ends thereof in spaced vertical arcuate paths from asubstantially horizontal inactive position to a substantially verticalposition, means mounted adjacent and operatively connected to the legsremote from the tie bar for moving said legs in the arcuate paths,brackets on said base frame, arms pivotally mounted to said brackets,and resilient tongues mounted on said arms adjacent the means for movingthe legs and engaging the legs for stabilizing the legs as they move inthe arcuate paths.

3. In a mine beam lifting jack an elongated substantially horizontallydisposed tie bar, a pair of elongated spaced legs pivotally connectedintermediate their ends to the tie bar for movement adjacent oppositeends thereof in spaced vertical arcuate paths from a substantiallyhorizontal inactive position to a substantially vertical position, meansmounted adjacent and operatively connected to the legs remote fromY thetie bar for moving said legs in the arcuate paths, resilient tonguesmounted adjacent the means for moving the legs and engaging the legs forstabilizing the legs as they move in the arcuate paths, a support onsaid base frame, and means mounted on said support between the legs andoperatively connected to the tongues for disengaging the tongues fromthe legs during the movement of the legs to inactive position.

4. In a mine beam lifting jack an elongated substantially horizontallydisposed tie bar, a pair of elongated spaced legs pivotally connectedintermediate their ends to the tie bar for movement adjacent oppositeends thereof in spaced vertical arcuate paths from a substantiallyhorizontal inactive position to a substantially vertical position, meansmounted adjacent and operatively connected to the legs remote from thetie bar for moving said legs in the arcuate paths, resilient tonguesmounted between the legs to move in arcuate paths into and out ofengagement with the legs, a support on said base frame, means mounted onsaid support between the tongues and operatively connected thereto forzontal inactive position to a substantially vertical position, meansmounted adjacent and operatively connected to the legs remote from thetie bar for moving said legs in the arcuate paths, resilient tonguesmounted between the legs to move in arcuate paths into and out ofengagement with the legs, a support on said base frame, means mounted onsaid support between the tongues and operatively connected thereto formoving the tongues into and out of engagement with the legs, resilientmeans mounted adjacent the tongue moving means and operatively connectedthereto for holding the tongues in engagement with the legs underyielding pressure, longitudinal rows of spaced teeth carried by the legsfor successive engagement by the tongues, and means mounted beneath thetie bar and operatively connected to the legs for moving the legs in thearcuate paths.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 640,942 Peacock Jan. 9, 1900 1,254,527 Olson Jan. 22, 19181,774,926 Kruse Sept. 2, 1930 2,480,916 Gibson Sept. 6, 1949 2,512,534Shaw, Jr. June 20, 1950 2,576,908 Wallace Nov. 27, 1951 2,591,475Sullinger Apr. l, 1952

